Dental appliance



G. F. DU BUQUE.

DENTAL APPLIANCE.

APPLICATION FILED 1AN.20.1920.

Patented Aug. 10, 1920.

UNITED STATES GEORGE E. DU BUQUE, OF LOS ANGELES, CALIFORNIA.

DENTAL APPLIANCE.

Specification of Letters Patent.

Patented Aug. 10, 1920.

Application filed January 20, 1920. Serial No. 352,790.

To all whom it may concern.-

Be it known that I, GEORGE F. DU BUQUE, a citizen of the United States,residing at Los Angeles, in the county of Los Angeles and State ofCalifornia, have invented new and useful Improvements in DentalAppliances, of which the following is a specification.

This invention relates to dental appliances and more particularly todental engines including a percussion member, and the invention has forits object to improve the construction of percussion engines, and theinvention consists of the construction and combination and details, anembodiment of which is illustrated in the accompanying drawing anddescribed and claimed herein.

Figure 1 is a central longitudinal sectional view of the improvedengine, and

Fig. 2 is a transverse section on line 2-2 of Fig. 1

r Fig. 3 is a sectional view on line 3-3 of Fig. 4 is a sectional Viewshowing a modified form of the mounting; and Fig. 5 is a transversesection on line 5-5 of Fig. 4.

The improved tool comprises a tool holding member of suitableconstruction, and in this case consists of a reciprocating rod 2 whichis slidably mounted in suitable bearing 4 and 5, in this case extendingfrom one side and in the plane of a ring like casing 6. The outerbearing of the tool carrier or holder 2 is shown as threaded at 7 toreceive a suitable detachable mallet or other reciprocating operativepart or tool 8 and the carrier 2 is prevented from rotation as the tool8 is applied or removed in this case by forming a portion of the carrier2 with a flattened side or sides forming the outer bearing 4complementary thereto as indicated at 9. The bearing 4 may have appliedto it a detachable guard or jacket 10 in this case in the form of a tubethrough which the shank of the tool 8 is extended and beyond which theoperative end of the tool projects.

The reciprocating carrier 2 is operative preferably by pneumatic meanscomprising in this case a fan wheel 11 that is rotatively mounted on ashaft 12 in this case supported in central hubs 13 of spiders havingradial arms 14, the outer ends of which rest in suitable seats 15provided therefor on the inner surface of the ring like casing 6 theopposite sides of which are open and may be closed by disk like covers16 having there is a recoil spring thread flanges 17 engagingcomplementary threads formed therefor on the sides of the casing 6.

Fluid under pressure for the operation of the engine is supplied fromsuitable source as by means of a hose adapted to be connected to thenipple 18 extending from the I rear peripheral portion of the casing 6and in which there is mounted a control valve 19 having a lever arm 20connected to a manual controlling device 21 so extended along the casingas to be within convenient reach of one of the fingers of the hand ofthe operator. The valve link or lever is slidably mounted in a bearing22 against one side of which re-acts a spring 23 the opposite end ofwhich engages a collar 24 fixed on the link 21.

When air on the pressure is admitted by the valve 19 it impinges on thefan 11 and rotates the latter, the air escaping from an outlet 25.

During the rotation of the fan a part 11 on one of its blades acts as ahammer striking on the adjacent end to 2 of the reciprocating toolcarrier 2 and the latter is thrown forward, throwing the tool 8 on itsworking stroke.

I prefer to provide for the automatic recovery or recoil of the slide orcarrier 2 with the tool so as to prevent the full driving force of thehammer l1 from being delivered through the tool 8 and therefore Iarranged on the intermediate threaded part 2 a nut 2 between which andthe bearing 4 26 and on the opposite side of the nut 2 there is anotherspring 27 bearing against the adjacent end of the bearing 5. Thesesprings operate to bring a sliding organization to a centralintermediate position but hold the inner end 2 of the carrier 2 in thepath of the hammer 11 The hammer 11 is preferably mounted on a radialarm 11 that is resilient so that a portion of the force of its impact isabsorbed in the bending of its spring arm. It will be seen that when thetool carrier 2 is projected to drive the tool 8 on its working strokethat a portion of the force is absorbed by the recoil spring 26 but theforce of the blow may also be regulated by the degree of opening of thevalve 19.

There is shown in Figs. 4 and 5 a slightly modified form of mounting forthe reciprocating rod 2 and its extension 2*. In this form of the devicethe casing part 5 is extended in the form of a nipple that is threadedat 5 and on this there is'mounted a coupling 30 into section 10 isscrewed. The coupling 30 has a non-circular aperture to receive thecomplementary portion 9 01": the rod 2 which latter is provided on thethreads 2. and the nut V 2 which is exposed in an aperture 5 in theupper portion of the nipple 5 so that the nut may be readily engaged andturned when it isexposcd by rotating a jacket 31 mounted on the nipple 5This jacket is shown in Fig. 5 as having a peripheral slot 31 to be imoved around into register with the opening 5 of the nipple. 7

Various changes may be made without departing from the spirit of myinvention, as claimed. 7 I I claim: V 1. A dental engine having, incombination, a reciprocating tool holder; means for an intermediatemaintaining the holder in posltion for yielding action 111 opposite d1-rectionsg and means for reciprocating the holder, said means including apneumatic,

rotary motor.

which the tubular end 3. In a dental engine, the combinationof V areciprocating tool holder, means for yieldably maintaining the holder inintermediate position, and fluid pressure actuated rotary means formovingsaid holder in one direction.

4%. In a dental engine, the combination of a reciprocating tool holder,means foryieldv ingly maintaining the holder in intermediate position,and means for actuating said holder in one direction, said meanscomprising a fluid pressureactuated motor having an extended vaneadapted to successively strike one end of said tool-holder.

Intestimonywhereof I have signedmyname to this specification. v g o 4GEO. F.-DU BUQUE. V

